Answer:
f^3 (4)= f(2.5)=1/2 x 2.5 + 1=2.25
Step-by-step explanation:
Thats it my guy that is the function
I would comment it but I can't so I put it as an answer.
y = 180° - x
x = 180° - (82° + 54°) } => y = 82° + 54° = 136°